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Set ImageUrl and AlternateText for asp

<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     Sub Page_Load()         Dim rnd As New Random()         Select Case rnd.Next(3)             Case 0                 imgRandom.ImageUrl = "Picture1.gif"                 imgRandom.AlternateText = "Picture 1"             Case 1                 imgRandom.ImageUrl = "Picture2.gif"                 imgRandom.AlternateText = "Picture 2"             Case 2                 imgRandom.ImageUrl = "Picture3.gif"                 imgRandom.AlternateText = "Picture 3"         End Select     End Sub      </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">     <title>Show Image</title> </head> <body>     <form id="form1" runat="server">     <div>          <asp:Image         id="imgRandom"         Runat="server" />          </div>     </form> </body> </html>